document which version of the plugin generated the test
resolve mswin32 failures

cmd.exe doesn't use single quotes, so we were getting something like:
perl -Ilib -e "require module; print "module ok""

e.g. see
http://www.cpantesters.org/cpan/report/4b3f80ef-6e3d-1014-b109-8d9eb77d427c

There may be more issues, but we need to solve this one first before we can
clearly see them.
v2.005

 - fixed use of quoting in shell command to resolve mswin32 issues (introduced
   in 2.003)